Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W76/00—Connection management
  • H04W76/10—Connection setup
  • H04W76/18—Management of setup rejection or failure
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/24—Reselection being triggered by specific parameters
  • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/0005—Control or signalling for completing the hand-off
  • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
  • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/0005—Control or signalling for completing the hand-off
  • H04W36/0055—Transmission or use of information for re-establishing the radio link
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/0005—Control or signalling for completing the hand-off
  • H04W36/0055—Transmission or use of information for re-establishing the radio link
  • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/0005—Control or signalling for completing the hand-off
  • H04W36/0055—Transmission or use of information for re-establishing the radio link
  • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/04—Reselecting a cell layer in multi-layered cells
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/08—Reselecting an access point
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
  • H04W52/02—Power saving arrangements
  • H04W52/0209—Power saving arrangements in terminal devices
  • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
  • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W76/00—Connection management
  • H04W76/20—Manipulation of established connections
  • H04W76/27—Transitions between radio resource control [RRC] states
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W76/00—Connection management
  • H04W76/30—Connection release
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
  • H04W88/02—Terminal devices
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
  • Y02D30/00—Reducing energy consumption in communication networks
  • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

• This application is related to wireless communications.
• UEs in a universal telecommunications radio access network are typically in either of two modes: Idle or Connected. Based on UE mobility and activity while in connected mode, the UTRAN can direct the UE to transition between a number of sub-states, such as cell paging channel (Cell_PCH), UTRAN Registration Area Paging Channel (URA_PCH), cell forward access channel (Cell_FACH), and Cell_DCH.
• Cell_PCH cell paging channel
• UUA_PCH UTRAN Registration Area Paging Channel
• Cell_FACH cell forward access channel
• Cell_DCH Cell_DCH
• the Cell_DCH state is characterized by dedicated channels in both the uplink and the downlink. On the UE side, this corresponds to continuous transmission and reception and can be demanding on user power requirements.
• the Cell_FACH state does not use dedicated channels and thus allows better power consumption, at the expense of a lower uplink and downlink throughput.
• HSDPA High-Speed Downlink Packet Access
• 3GPP Third Generation Partnership Project
• HSDPA tries to make better use of the downlink shared capacity by using concepts such as Adaptive Modulation and Coding (AMC), retransmissions using a Hybrid- ARQ (HARQ) scheme, and Node B scheduling - all operating at a very fast rate.
• Packet data units (PDUs) are combined by the HARQ, and subsequently stored in a reordering queue to deal with possible out-of-order reception.
• Downlink transmissions are addressed to a UE via an HS-DSCH Radio Network Identifier (H-RNTI).
• H-RNTI HS-DSCH Radio Network Identifier
• HS-DSCH reception in CELL_FACH can be configured without HS-DSCH reception in CELL_PCH and URA_PCH.
• High speed downlink shared channel (HS-DSCH) reception in CELL_PCH and URA_PCH without the support of HS-DSCH reception in CELL_FACH is not supported.
• the UE support for these features is signaled to the network. It should be understood that the embodiments presented can be extended to cases where the support for HSDPA in CELL-FACH and/or CELL_PCH/URA_PCH can be individually signaled to the network. [0008] On the other hand, the network signals its support for enhanced
• SIB5/5bis System Information Block
• a UE is assigned a common H-RNTI to receive traffic when it has not been assigned a dedicated H-RNTI. Three such situations are as follows:
• Radio Resource Control RRC CONNECTION REQUEST message (and UE is waiting for an RRC CONNECTION SETUP response from the network).
• RRC Radio Resource Control
• CELL UPDATE CELL UPDATE CONFIRM response from the network.
• UE sends a URA UPDATE message and is waiting for a URA UPDATE CONFIRM response from the network.
• HSDPA was only supported in CELL_DCH.
• MAC resets e.g., a mac-hs reset
• the UE underwent a radio link failure the UE experienced an RLC unrecoverable error, or the UE was ordered to transition to a state where HSDPA was not supported (all states except CELL-DCH).
• a UE may be required to perform a MAC reset in the following states: CELL_DCH, CELL_FACH, CELL/URA_PCH.
• the UE is required to perform a MAC reset after ALL cell reselections.
• this is only done when the WTRU with a dedicated H- RNTI performs a cell reselection. There are a number of scenarios where this reset is not performed, resulting in possible reordering errors.
• Transitions to/from IDLE have also been impacted by the introduction of Enhanced CELL_FACH.
• a Release 7 UE supports HSDPA reception in CELL_FACH state, this UE also supports limited HSDPA reception while in IDLE mode ; in particular after a UE has issued an RRC CONNECTION REQUEST, and is waiting for an RRC CONNECTION SETUP message from the network.
• Three issues have been identified: 1) If the UE has begun HSDPA reception while in IDLE (after issuing a RRC CONNECTION SETUP message), any cell reselections should result in a MAC reset.
• a UE While in IDLE mode, a UE may cell reselect from a cell that supports Enhanced CELL FACH to one that does not, and vice versa. If the UE has initiated an RRC connection procedure, two issues may need to be addressed. First, for a Release 6 to a Release 7 transition, the UE is required to setup the HSDPA resources so that it can receive the RRC CONNECTION SETUP message on the HS-DSCH. Second, for a Release 7 to Release 6 transition, the UE should release all HSDPA resources, as no traffic is expected on the HS- DSCH.
• Enhanced CELL_FACH Another new feature of Enhanced CELL_FACH is that the UE will be able to receive dedicated control messages while in CELL_PCH (over the DCCH). Accordingly, a UE may be asked to perform a reconfiguration, (e.g., radio bearer, transport channel, physical channel). Reconfiguration messages can also result in a state change.
• a reconfiguration e.g., radio bearer, transport channel, physical channel.
• the UE In order to allow proper configuration of HSDPA resources the UE should properly manage the setting or clearing of the variable HS-DSCH-RECEPTION-OF-CCCH-ENABLED to ensure that it is only set to TRUE when the UE is using the common H-RNTI while in an enhanced Cell_FACH state. It should be set to FALSE in all other. Lastly, cell reselections occurring during ongoing cell update or URA update procedures should behave similarly to cell reselections when these procedures are not ongoing. [0017] It would therefore be beneficial to provide a method and apparatus for handling cell reselections and transitions to and from an enhanced CELL FACH state. [0018] SUMMARY
• a method and apparatus for handling cell reselections, transitions, and Cell_DCH radio link failures is disclosed.
• the method includes executing a cell reselection.
• a medium access control (MAC)-ehs reset is performed.
• FIG. 1 shows an example wireless communication system including a plurality of wireless transmit/receive units (WTRUs) and a Node B;
• WTRUs wireless transmit/receive units
• Figure 2 is an example functional block diagram of a WTRU and the
• Figure 3 is a flow diagram of a method for handling cell reselections and transitions to and from an enhanced CELL_FACH state.
• wireless transmit/receive unit includes but is not limited to a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless environment.
• base station includes but is not limited to a Node-B, a site controller, an access point (AP), or any other type of interfacing device capable of operating in a wireless environment.
• Release 7 includes but is not limited to a WTRU or Node B that supports HS-DSCH in CELL_FACH and/or CELL/URA_PCH and "Release 6 (R6)” includes but is not limited to a WTRU or Node B that does not support HS-DSCH in CELL_FACH and/or CELL/URA_PCH.
• HS-DSCH in CELL_FACH also includes HS-DSCH reception in idle mode for the reception of RRC connection procedures.
• CELL_FACH state includes but is not limited to a WTRU that is using HSDPA resources in a state other than CELL_DCH.
• Figure 1 shows an example wireless communication system 100 including a plurality of WTRUs 110, a Node B 120, and a radio network controller (RNC) 130.
• the WTRUs 110 are in communication with the Node B 120, which is in communication with the RNC 130.
• RNC radio network controller
• Figure 2 is an example functional block diagram 200 of a WTRU 110 and the Node B 120 of the wireless communication system 100 of Figure 1.
• the WTRU 110 is in communication with the Node B 120.
• the Node B 120 is configured to handle cell reselections and transitions to and from an enhanced Cell_FACH state.
• the WTRU 110 includes a processor 115, a receiver 116, a transmitter 117, and an antenna 118.
• the receiver 116 and the transmitter 117 are in communication with the processor 115.
• the antenna 118 is in communication with both the receiver 116 and the transmitter 117 to facilitate the transmission and reception of wireless data.
• the processor 115 of the WTRU 110 is configured to handle cell reselections and transitions to and from an enhanced Cell_FACH state.
• FIG. 3 is a flow diagram of a method 300 for handling cell reselections out of an enhanced CELL-FACH state. Although specifics of the method 300 will be described in greater detail below, in general, a WTRU 110 executes a cell reselection (step 310).
• MAC-ehs reset is performed (step 320) due to the fact that the source of the HS-DSCH may have changed.
• the WTRU 110 may clear HSDPA resources and stop HS-DSCH reception procedures.
• the MAC-hs/ehs reset is performed when a cell reselection occurs while the WTRU 110 is waiting for a CELL_UPDATE_CONFIRM message.
• the reset may be performed in all cases upon cell reselection, (i.e., even when the WTRU does not have a dedicated H- RNTI), or only when the WTRU has ongoing HSDPA reception, (i.e., when the WTRU is receiving HS-DSCH prior to cell reselection).
• the WTRU 110 may detect "in service area" if it has not entered idle mode. In this case, if the cell update or URA update procedure counter is less than or equal to a maximum number of retransmissions of the cell update/URA update message, then the WTRU 110 may perform a cell reselection.
• FDD frequency division duplex
• the WTRU 110 may reset the MAC-ehs entity.
• the WTRU 110 may, after performing cell selection, reset the MAC-ehs entity after a radio link failure from CELL_DCH.
• the WTRU 110 may be using a common H-RNTI, rather than a dedicated H-RNTI, a reset may allow reception of a new MAC flow, (e.g., for CCCH and SRBl).
• the WTRU 110 may initiate a cell update procedure as a result of a radio link failure while in CELL_DCH. For FDD, if the WTRU 110 supports HS-DSCH reception and the information element (IE) "HS-DSCH common system information" is included in SIB5 or SIB ⁇ bis, then the WTRU 110 may reset the MAC-ehs entity.
• IE information element
• the WTRU 110 may, after performing a cell reselection without a dedicated H-RNTI, reset the MAC-ehs entity.
• the WTRU 110 may initiate a URA update or cell update procedure. If the WTRU 110 performed a cell reselection, then for FDD, if the WTRU 110 supports HS-DSCH reception and the information element (IE)
• IE information element
• WTRU 110 may reset the MAC-ehs entity.
• WTRU 110 is allowed to use HS-DSCH reception in IDLE mode
• the WTRU 110 transmits a RRC CONNECTION REQUEST, it monitors the downlink transmissions to determine the RNC response. During this time the WTRU 110 may perform cell reselections.
• the WTRU 110 may transition from a cell that supports HSDPA reception in CELLJFACH and
• the WTRU CELL/URA_PCH to one that no longer supports HS-DSCH reception.
• HSDPA resources may clear, or release HSDPA resources and stop HS-DSCH reception procedures.
• WTRU 110 may check that the RRC CONNECTION procedure counter (currently referred to in the standard as V300) is less than or equal to the maximum number of retransmissions of the RRC CONNECTION REQUEST message (currently referred to in the standard as N300), and if cell reselection occurred, for FDD, and if the WTRU 110 supports HS-DSCH reception and if IE:
• the WTRU 110 may release HSDPA resources by stopping HS_SCCH and HS- DSCH reception procedures. Additionally, the WTRU 110 may clear the variable
• the WTRU 110 may also release all HARQ resources.
• the WTRU 110 may choose to perform the above only when HSDPA resources are being used prior to cell reselection.
• the WTRU 110 actions can be triggered by using an existing
• HS_DSCH_RECEPTION variable or a new HS_DSCH_RECEPTION variable may be defined as a flag to denote HSDPA resource use, thereby triggering a resource release.
• the WTRU 110 may transition across cells that support HSDPA reception in CELL_FACH and
• the WTRU may perform a MAC-ehs reset.
• WTRU 110 may check that the RRC CONNECTION procedure counter (V300) is less than or equal to the maximum number of retransmissions of the RRC CONNECTION REQUEST message (N300), and if cell reselection occurred, for FDD, and if the WTRU 110 supports HS-DSCH reception and if IE: "HS-DSCH common system information" is included in SIB5 or SIB ⁇ bis, and if the variable "HS-
• DSCH-RECEPTION-OFF-CCCH-ENABLED is set to TRUE, then , the WTRU
• the WTRU 110 may transition from a cell that does not support HSDPA reception in CELL_FACH and
• the WTRU 110 may be required to setup the HS-DSCH, (e.g., HARQ resources, common H-RNTI, MAC flow for CCCH traffic, and the like).
• the HS-DSCH e.g., HARQ resources, common H-RNTI, MAC flow for CCCH traffic, and the like.
• WTRU 110 may check that the RRC CONNECTION procedure counter (V300) is less than or equal to the maximum number of retransmissions of the RRC CONNECTION REQUEST message (N300), and if cell reselection occurred, for FDD, and if the WTRU 110 supports HS-DSCH reception and if IE: "HS-DSCH common system information" is included in SIB5 or SIB ⁇ bis, and if the variable "HS- DSCH_RECEPTION_OFF_CCCH_ENABLED" is
• a WTRU 110 in IDLE mode may set the CCCH flag to
• variable should be set to TRUE each time the system information is read in an R6 cell or anytime the WTRU 110 is in an R6 cell and transitions to IDLE mode from connected mode. This can be achieved by changing the actions when entering idle mode from connected mode.
• the WTRU 110 sets the CCCH flag to TRUE and then performs the actions related to this variable. For example, the WTRU 110 may send an RRC CONNECTION REQUEST message and be waiting for an RRC CONNECTION SETUP MESSAGE. If there is a cell reselection, and the transition is from an R7 to R7 cell, the MAC-ehs entity is reset only.
• variable HS-DSCH-RECEPTION-OF-CCH-ENABLED is set to "true" and the WTRU 110 begins receiving the HS-DSCH. If the transistion is from an R7 to R6 cell, then HS-SCCH reception procedures are stopped, HS-DSCH reception procedures are stopped, the MAC-ehs entity is reset, HARQ resources are released, and store "HARQ info" IEs are cleared. [0053] The variable HS_DSCH_RECEPTION_OF_CCCH_ENABLED is used as a flag to denote that the WTRU 110 is using a common H-RNTI.
• This variable should be set to "FALSE" when the WTRU 110 is not using its common H-RNTI. This may ensure that evaluation of the variable HS-DSCH-RECEPTON-CELL-FACH-STATE will correctly clear resources only when a dedicated H-RNTI is assigned to the WTRU 110.
• Receiving on the common H-RNTI is typically possible when the WTRU 110 has performed a cell reselection and is waiting for the CELL UPDATE CONFIRM message, or when the WTRU 110 has performed a URA reselection and is waiting for the URA UPDATE CONFIRM message, or when the WTRU 110 has initiated an RRC setup and is waiting for the RRC CONNECTION SETUP message.
• the WTRU 110 After receiving an RRC CONNECTION SETUP message that will send the WTRU 110 in the CELL-DCH state, then the WTRU 110 sets variable HS-DSCH-RECEPTION-OF-CCCH-ENABLED to "FALSE". [0055] The WTRU 110 may terminate activities associated with
• the WTRU 110 should stop the periodic cell update timer. If the network requests a transition to CELL-FACH or if a new configuration is provided for CELL-PCH, the WTRU 110 should perform actions similar to those when transitioning to CELL-FACH.
• the WTRU 110 may select a suitable cell on the provided frequency. If the if IE "Frequency info" is not included in the received reconfiguration message, the WTRU 110 may prohibit periodical status transmission in the RLC, and it may start the timer currently referred to in the standard as T305. If the IE "New C-RNTI" is not included in the reconfiguration message, the WTRU 110 can clear variables C-RNTI, H-RNTI, as well as any stored HARQ information, and may also reset the MAC-ehs entity.
• the WTRU 110 may start monitoring the paging occasions on the selected PICH, and if the IE "UTRAN DRX cycle length coefficient" is included, it can use this value to determining the paging occasions.
• Examples of computer-readable storage mediums include a read only memory (ROM), a random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
• ROM read only memory
• RAM random access memory
• register cache memory
• semiconductor memory devices magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
• Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine.
• a processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer.
• WTRU wireless transmit receive unit
• UE user equipment
• RNC radio network controller
• the WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) or Ultra Wide Band (UWB) module.
• modules implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD)
• a method for handling cell reselections and transitions comprising executing a cell reselection.
• MAC medium access control
• H-DSCH high speed downlink shared channel
• H-RNTI radio network identifier
• HSDPA high speed downlink packet access
• HS-SCCH high speed shared control channel
• HS-DSCH high speed downlink shared channel
• a method as in any preceding embodiment further comprising clearing an H-RNTI variable and removing a stored H-RNTI. 12. A method as in any preceding embodiment, further comprising releasing hybrid automatic repeat request (HARQ) resources.
• HARQ hybrid automatic repeat request
• CCCH common control channel
• a wireless transmit/receive unit configured to perform a method as in any preceding embodiment.
• a WTRU as in any of embodiments 19-22 wherein a processor is configured to execute a cell reselection.
• a WTRU as in any of embodiments 19-23 wherein a processor is configured to perform a medium access control (MAC)-ehs reset.
• MAC medium access control
• a WTRU as in any of embodiments 19-24 wherein a processor is configured to transmit a cell update message.
• a WTRU as in any of embodiments 19-25 wherein a processor is configured to set a variable HS_DSCH_RECEPTION_OF_CCCH_ENABLED to true.
• a WTRU as in any of embodiments 19-26 wherein a processor is configured to release high speed downlink packet access (HSDPA) resources.
• HSDPA high speed downlink packet access
• a WTRU as in any of embodiments 19-27 wherein a processor is configured to stop high speed shared control channel (HS-SCCH) reception procedures.
• HS-SCCH high speed shared control channel
• a WTRU as in any of embodiments 19-28 wherein a processor is configured to stop high speed downlink shared channel (HS-DSCH) reception procedures.
• HS-DSCH high speed downlink shared channel
• HARQ hybrid automatic repeat request
• a WTRU as in any of embodiments 19-31 wherein a processor is configured to set a common control channel (CCCH) flag to a true state.
• CCCH common control channel
• a WTRU as in any of embodiments 19-32 wherein a processor is configured to set a common control channel (CCCH) flag to a false state.
• CCCH common control channel
• a WTRU as in any of embodiments 19-33 wherein a processor is configured to terminate CELLJ 3 CH procedures.
• An integrated circuit configured to perform a method as in any of embodiments 1-18.
• MAC medium access control
• T A method as in any of embodiments 1-18 and 42-48 wherein a HS DSCH RECEPTION OF CCCH ENABLED variable is set to false

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